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M13 pict with LS6


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#1 fjhdavid

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Posted 31 August 2016 - 09:43 AM

Hello,

 

I did my first DSO picture, M13 with an LS6 + antares reducer 6.3 + APN Eos T2i  (one CCD pixel = 1.1 arcsec)

 

12 frames of 60s exposure time but I kept only 5 of them

 

Image processing: DeepSkyStacker + Iris (Lucy Richardson deconvolution filter)

 

Francois

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#2 MistrBadgr

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Posted 31 August 2016 - 10:40 AM

Thanks, Francois, for sharing!  Nice image of M-13, which is always fascinating.

 

I look forward to see more of your exploits!

 

Best Regards,

 

BIll Steen


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#3 Bob Arnold

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Posted 31 August 2016 - 12:27 PM

Francois,

Nice image. Is there much light pollution where you live?  I noticed that your tracking looks very good. Does the software you use utilize star registration?

Bob Arnold 


Meade LS-8 ACF, ZWO ASI120, Mallincam Skyraider DSc, Ipad Air-SkySafari Pro, SkyFi, and an assortment of had to have items that don't get used.


#4 fjhdavid

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Posted 01 September 2016 - 07:18 AM

I was on holidays with a clear sky (I would say, after picture measurement, that the background level is around mag 19.5 / 20)

 

I use "Iris" software from C. Buil, which is a free astro software which implement the "Lucy Richardson" deconvolution filter. This filter is used with the Hubble telescope. The only drawback is the consuming time (around 10mn for a 1024x1024 pixels frame). But the results are incredible.

 

Francois

 

PS: I tested several exposure time from 15s to 240s (with a step of 15s between each image); 60s is the best option, but you will have to leave about 60% of "bad quality frames" before stacking them. But, "DeepSkyStacker" will do the selection automatically for you and it is a free software!



#5 gfamily

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Posted 02 September 2016 - 03:50 PM

Is that cropped? - I've got a wider image without a focal reducer with my dSLR. 

As per 

 

M13 Tiff alt (2).jpg



#6 fjhdavid

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Posted 02 September 2016 - 10:53 PM

yes it is crop to 1024x1024 around the image center, in order to reduce the processing time.

 

your picture looks great!!

 

could you, please, tell me your exposure time and number of stacking frames?

 

and load a.bmp picture?

 

thanks



#7 gfamily

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Posted 03 September 2016 - 03:57 PM

Hi - they were 20 second exposures at ISO 3200. 

 

I stacked 6 images for that one - but I think I need a tutorial in DSS to be able to get a better image. 



#8 fjhdavid

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Posted 04 September 2016 - 11:08 PM

DSS is very powerful and the defaults settings are very good.

 

I just choose the "RGB channel alignment" and the cosmetic pixels removal (1pixel and 50%). The two background calibration are good! anyway, you will have to do a color balance, at the end, in order to choose the final "look" that you prefer :)

 

After that, when the frames registration is finished (thanks to the "score" parameter), I always have a look to the FWHM of the best frames and I always check visually the best frames I plan to keep.

 

and that's all, at least for me!

 

Fran├žois

 

ps: Don't forget to remove the offset frames! (dark removal for APN is not necessary, at least for short exposure time)



#9 Betty L Myers

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Posted 04 October 2016 - 09:39 AM

I say thanks s too..

They are very nice pics. I have the LS 8" and a Novas' at this and hope to be able to take pics as good as yours some day.  I am learning from you and I thank you very much for the info..






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